#!/bin/bash

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo echo "# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释                                             " > /etc/apt/sources.list
sudo echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse                   " >> /etc/apt/sources.list
sudo echo "# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse             " >> /etc/apt/sources.list
sudo echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse           " >> /etc/apt/sources.list
sudo echo "# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse     " >> /etc/apt/sources.list
sudo echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse         " >> /etc/apt/sources.list
sudo echo "# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse   " >> /etc/apt/sources.list
sudo echo "deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse          " >> /etc/apt/sources.list
sudo echo "# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse    " >> /etc/apt/sources.list
sudo echo "                                                                                                              " >> /etc/apt/sources.list
sudo echo "# 预发布软件源，不建议启用                                                                                    " >> /etc/apt/sources.list
sudo echo "# deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse        " >> /etc/apt/sources.list
sudo echo "# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse    " >> /etc/apt/sources.list